In-plane switching mode liquid crystal display with a retardation layer formed directly on a color filter substrate in a reflection region
First Claim
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1. An in-plane switching mode liquid crystal display device comprising:
- a lower substrate and an upper substrate which face each other;
a gate line and a data line on the lower substrate such that the gate line and the data line cross each other to define a pixel region that is divided into a transmissive region and a reflective region;
a thin film transistor arranged at a crossing of the gate line and the data line;
a reflective plate in the reflective region;
a pixel electrode and a common electrode arranged in an alternating pattern at the pixel region;
a retardation layer arranged on and directly contacting the upper substrate to correspond to the reflective region;
a color filter layer and an overcoat layer entirely arranged over the retardation layer to compensate for a thickness of the retardation layer;
a liquid crystal layer between the upper substrate and the lower substrate; and
a first polarizing plate and a second polarizing plate at outer surfaces of the lower substrate and the upper substrate, respectively,wherein a cell gap of the liquid crystal layer in the transmissive region and a cell gap of the liquid crystal layer in the reflective region are the same and the overcoat layer has a relatively larger thickness in the transmissive region than in the reflective region to compensate for a thickness of the retardation layer.
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Abstract
An in-plane switching mode liquid crystal display device includes: a lower substrate and an upper substrate which face each other; a gate line and a data line on the lower substrate such that the gate line and the data line cross each other to define a pixel region that is divided into a transmissive region and a reflective region; a thin film transistor arranged at a crossing of the gate line and the data line; a reflective plate in the reflective region; a pixel electrode and a common electrode arranged in an alternating pattern at the pixel region; a retardation layer arranged on the upper substrate to correspond to the reflective region; a liquid crystal layer between the upper substrate and the lower substrate; and a first polarizing plate and a second polarizing plate at outer surfaces of the lower substrate and the upper substrate, respectively.
14 Citations
28 Claims
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1. An in-plane switching mode liquid crystal display device comprising:
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a lower substrate and an upper substrate which face each other; a gate line and a data line on the lower substrate such that the gate line and the data line cross each other to define a pixel region that is divided into a transmissive region and a reflective region; a thin film transistor arranged at a crossing of the gate line and the data line; a reflective plate in the reflective region; a pixel electrode and a common electrode arranged in an alternating pattern at the pixel region; a retardation layer arranged on and directly contacting the upper substrate to correspond to the reflective region; a color filter layer and an overcoat layer entirely arranged over the retardation layer to compensate for a thickness of the retardation layer; a liquid crystal layer between the upper substrate and the lower substrate; and a first polarizing plate and a second polarizing plate at outer surfaces of the lower substrate and the upper substrate, respectively, wherein a cell gap of the liquid crystal layer in the transmissive region and a cell gap of the liquid crystal layer in the reflective region are the same and the overcoat layer has a relatively larger thickness in the transmissive region than in the reflective region to compensate for a thickness of the retardation layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A liquid crystal display device comprising:
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a lower substrate and an upper substrate which face each other; a gate line and a data line on the lower substrate such that the gate line and the data line cross each other to define a pixel region that is divided into a transmissive region and a reflective region; a thin film transistor arranged at a crossing of the gate line and the data line; a reflective plate in the reflective region; a pixel electrode and a common electrode arranged in an alternating pattern at the pixel region; a retardation layer arranged on and directly contacting the upper substrate to correspond to the reflective region; a color filter layer and an overcoat layer entirely arranged over the retardation layer to compensate for a thickness of the retardation layer; a liquid crystal layer between the upper substrate and the lower substrate; and a first polarizing plate and a second polarizing plate at the lower substrate and the upper substrate, respectively, wherein a cell gap of the liquid crystal layer in the transmissive region and a cell gap of the liquid crystal layer in the reflective region are the same and the overcoat layer has a relatively larger thickness in the transmissive region than in the reflective region to compensate for a thickness of the retardation layer.
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28. A method of making an in-plane switching mode liquid crystal display device comprising:
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providing a lower substrate and an upper substrate which face each other; forming a gate line and a data line on the lower substrate such that the gate line and the data line cross each other to define a pixel region that is divided into a transmissive region and a reflective region; forming a thin film transistor at a crossing of the gate line and the data line; forming a reflective plate in the reflective region; forming a pixel electrode and a common electrode in an alternating pattern at the pixel region; forming a retardation layer on and directly contacting the upper substrate corresponding to the reflective region; forming a color filter layer and an overcoat layer entirely arranged over the retardation layer to compensate for a thickness of the retardation layer; forming a liquid crystal layer between the upper substrate and the lower substrate; and forming a first polarizing plate and a second polarizing plate at outer surfaces of the lower substrate and the upper substrate, respectively, wherein a cell gap of the liquid crystal layer in the transmissive region and a cell gap of the liquid crystal layer in the reflective region are the same and the overcoat layer has a relatively larger thickness in the transmissive region than in the reflective region to compensate for a thickness of the retardation layer.
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Specification
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Current AssigneeLG Display Co., Ltd.
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Original AssigneeLG Display Co., Ltd.
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InventorsNam, Mi Sook, Hong, Hyung Ki
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Primary Examiner(s)Merlin, Jessica M
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Application NumberUS11/637,054Publication NumberTime in Patent Office2,030 DaysField of Search349/114, 349/117, 349/141US Class Current349/114CPC Class CodesG02F 1/133555 TransflectorsG02F 1/133638 Waveplates, i.e. plates wit...G02F 1/134363 for applying an electric fi...
